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Calendar year of second H1N1 flu vaccination

Codes and Frequencies

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For sample children who had more than one H1N1 vaccine dose, VAC2H1N1DYR reports the year the child received his or her second most recent H1N1 flu vaccine.

VAC2H1N1DYR should be interpreted in conjunction with VAC2H1N1DMO, which reports the month of the child's second most recent H1N1 vaccination.

The survey questions associated with VAC2H1N1DYR were removed from the NHIS in August 2010.

VAC2H1N1DYR is part of a series of variables introduced in 2010 dealing with immunization. For other related variables, please use the IPUMS NHIS search function and drop-down menus.


There are no comparability issues.


  • 2010: Sample children under 18 in quarters 1 and 2 and the first several weeks of quarter 3 who have had more than one H1N1 vaccine doses.


  • 2010